65561607 has 6 divisors (see below), whose sum is σ = 94700112. Its totient is φ = 43707732.

The previous prime is 65561603. The next prime is 65561611. The reversal of 65561607 is 70616556.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (65561603) and next prime (65561611).

It is not a de Polignac number, because 65561607 - 2² = 65561603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65561603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3642303 + ... + 3642320.

It is an arithmetic number, because the mean of its divisors is an integer number (15783352).

Almost surely, 2^65561607 is an apocalyptic number.

65561607 is a deficient number, since it is larger than the sum of its proper divisors (29138505).

65561607 is a wasteful number, since it uses less digits than its factorization.

65561607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7284629 (or 7284626 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 65561607 is about 8097.0122267414. The cubic root of 65561607 is about 403.2272401936.

The spelling of 65561607 in words is "sixty-five million, five hundred sixty-one thousand, six hundred seven".